这篇文章主要介绍了如何用ObjectMapper将复杂Map转换为实体类的操作，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
ObjectMapper将复杂Map转为实体类
背景
用fastjson转换复杂Map是浅层的可以转 深层的转换为null.，这时候可以用jackson来转。
1.使用ObjectMapper要添加的依赖是
com.fasterxml.jackson.core jackson-databind 2.8.3
2.将复杂Map开始转换
ObjectMapper mapper = new ObjectMapper(); Resource resource = mapper.convertValue(Map, Resource.class);
注意的点：实体类中的字段是驼峰的 首字母不能大写。
objectMapper 解析复杂json toMap
public void parseSettings(){ String settings = "{\"基本设置\":{\"name\":\"基本设置\",\"entries\":[{\"name\":\"站号\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"AppEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"2C26C503A0010006\"},{\"name\":\"DevEUI\",\"type\":\"string\",\"description\":\"\",\"value\":\"4A7703A000FC09\"},{\"name\":\"命令次数\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"父井号\",\"type\":\"string\",\"description\":\"\",\"value\":\"test11\"}]},\"油阀间\":{\"name\":\"油阀间\",\"entries\":[{\"name\":\"上传间隔时间\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"},{\"name\":\"设定值\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"},{\"name\":\"波动值\",\"type\":\"number\",\"description\":\"\",\"value\":\"1\"},{\"name\":\"控制模式\",\"type\":\"number\",\"description\":\"\",\"value\":\"0\"},{\"name\":\"调节上限\",\"type\":\"number\",\"description\":\"\",\"value\":\"15\"},{\"name\":\"调节下限\",\"type\":\"number\",\"description\":\"\",\"value\":\"5\"},{\"name\":\"调节时间\",\"type\":\"number\",\"description\":\"\",\"value\":\"10\"}]},\"采集调度\":{\"name\":\"采集调度\",\"entries\":[{\"name\":\"interval\",\"type\":\"number\",\"description\":\"\",\"value\":\"2\"}]}}"; ObjectMapper objectMapper = new ObjectMapper(); JavaType javaType = objectMapper.getTypeFactory().constructMapType(HashMap.class, String.class, SettingGroup.class); try { Map mapSettings = objectMapper.readValue(settings, javaType); SettingGroup group = mapSettings.get("基本设置"); for (SettingEntry entry : group.getEntries()) { System.out.println(entry.getName()); } group = mapSettings.get("油阀间"); for (SettingEntry entry : group.getEntries()) { System.out.println("entry.Name:"+entry.getName()+" entry.getValue:"+entry.getValue()); } } catch (JsonParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JsonMappingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } 以上就是如何用ObjectMapper将复杂Map转换为实体类的详细内容，更多请关注0133技术站其它相关文章！
